Is it possible to convert an analog meter that measures up to 500mA to read
up to 1 amp and also 1.5 amps.
This is to measure the draw on a 12 volt DC circuit. Motor is supposed to
draw 0.91A
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It's possible, and all that's required is to place a resistance in
parallel with the meter which, in the 1 amp case, diverts 1/2 of the
current around the meter and through the resistor, and in the 1.5 amp
case, diverts 2/3 of the current.
In order to determine the value of the resistor, however, we'll need
to know the internal resistance of the meter. If you have a
manufacturer and a part number for the meter we may be able to find
that information on the web. If you don't, then unless it's written
on the meter somewhere, you'll have to measure it. Do you have any
test equipment available?